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Related Experiment Videos

Gradual disc prolapse.

M A Adams, W C Hutton

    Spine
    |July 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    This study investigated gradual intervertebral disc prolapse in lumbar spine cadavers. Six discs showed gradual prolapse, initiating with annular fissures and nuclear pulp extrusion into the spinal canal.

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    Area of Science:

    • Biomedical Engineering
    • Orthopedics
    • Spinal Biomechanics

    Background:

    • Intervertebral disc degeneration is a common cause of low back pain.
    • Understanding the mechanisms of disc prolapse is crucial for developing effective treatments.

    Purpose of the Study:

    • To determine if intervertebral discs can prolapse gradually under fatigue loading.
    • To observe the initial stages and progression of disc prolapse.

    Main Methods:

    • Fifty-two cadaveric lumbar motion segments were subjected to cyclic compression and bending.
    • The nucleus pulposus was stained to monitor prolapse via direct observation and discography.

    Main Results:

    • Six discs exhibited gradual prolapse, characterized by radial annulus fissures and nuclear pulp extrusion.

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  • Prolapse commonly occurred in lower lumbar discs of younger cadavers.
  • Older discs with pre-existing ruptures remained stable.

    • Conclusions:

    • Gradual intervertebral disc prolapse is possible under specific loading conditions.
    • The mechanism involves annular lamellar distortion leading to nuclear pulp extrusion.
    • Younger individuals' lower lumbar discs may be more susceptible to this type of injury.